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Chapter 2: Concept of plant disease 2.1. Introduction to plant disease 2.1.1. What is a plant disease? 2.1.2. Importance of plant disease 2.1.3. Development of Plant Pathology as a science 2.2. Causes of plant diseases 2.2.1. Non-infectious disease 2.2.2. Infectious disease 2.3. Conditions for disease development 2.4. Process of disease development 2.4.1. Pathogenesis 2.4.2. Infection process 2.5. General symptoms of plant diseases 2.6. Disease management 2.7. Glossary of terms in plant pathology Note: All the above contents are covered in the handout title PLANT DISEASE.